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Vitamin B12 Blood Test: Uses, Normal Range, and Results How does Vitamin B12 deficiency get diagnosed? How Long Does It Take For B12 Injections To Work? Are B12 Shots Safe? Royal Palm Beach Medical Group Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and keeping nerves
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